5 Answers

Sounds like 2 issues, first heater core leaking maybe you can bypass it until you can replace it, second the EVAP System needs looked at, May be a purge solenoid or EVAP cannister or some other EVAP issue.

We're talking 1956 Belvedere ,,,the engine controls consist of a Carburetor, a mechanical
fuel pump and a gas pedal ... this car was built when the vacuum tube was still dominant
in radio's/TV's.... Are you certain the gas gauge is accurate ? Perhaps you think that you
need gas when the tank is almost full ,,,,If you raise the hood and look toward the back of
the engine compartment ,, you will see 2 hoses at the wall separating the engine from the
passenger compartment .. you need to take those hoses off and join them together using
a small piece of copper pipe ( 1/2" should do it) and 2 hose clamps ... you have bypassed
the heater and you can now expect to freeze your butt off

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